The first one aooears to be an unusually dark Elysia diomedea. It's surprising to see it in a LFs as the normal geographic range is from the Gulf of California to Panama and I didn't think LFSs carried much from that part of the world. It eats algae. The only verified reports are that it feeds on Padina (brown) and Spyridia (red) but the slug experts think it probably also feeds on green algae. The neat thing about this kind of slug is that it captures chloroplasts from its food algae & incorporates them into its own tissue. The chloroplasts continue to live & provide the slug with additional nutrition.
The second is Ceratosoma tenue, common in the Indo-Pacific. Members of this genus are sponge eaters and usually will eat only one or a few particular sponges.
Most branchs only live about a year. There's no telling where they are in their life cycles. Hopefully they'll find enough in your tank to eat & survive for a while.
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